Abstract
We perform frequentist and Bayesian statistical analyses of Higgs- and Z-portal models of dark matter particles with spin 0, 1/2 and 1. Our analyses incorporate data from direct detection and indirect detection experiments, as well as LHC searches for monojet and monophoton events, and we also analyze the potential impacts of future direct detection experiments. We find acceptable regions of the parameter spaces for Higgs-portal models with real scalar, neutral vector, Majorana or Dirac fermion dark matter particles, and Z-portal models with Majorana or Dirac fermion dark matter particles. In many of these cases, there are interesting prospects for discovering dark matter particles in Higgs or Z decays, as well as dark matter particles weighing $\gtrsim 100$ GeV. Negative results from planned direct detection experiments would still allow acceptable regions for Higgs- and Z-portal models with Majorana or Dirac fermion dark matter particles.
Highlights
In the last few decades, numerous astrophysical and cosmological observations have confirmed the need for dark matter (DM) via its gravitational interactions, with the most precise estimate of its density being provided by Planck satellite measurements of the cosmic microwave background radiation in combination with other experiments [1]
DM is composed of weakly interacting massive particles (WIMPs) that were in thermal equilibrium with Standard Model (SM) particles in the early Universe
We have presented Bayesian and frequentist appraisals of models with DM of spin 0, 1=2, or 1 that interacts with SM particles and annihilates via interactions with the SM Higgs or Z boson, in light of constraints from Planck, direct detection (DD), indirect detection (ID), and LHC experiments
Summary
In the last few decades, numerous astrophysical and cosmological observations have confirmed the need for dark matter (DM) via its gravitational interactions, with the most precise estimate of its density being provided by Planck satellite measurements of the cosmic microwave background radiation in combination with other experiments [1]. [17,18], we disregard UVcompletion-dependent details concerning the origins of any higher-order operators and assume that any new states in the UV completions are so massive that they cannot impact the phenomenology This approach allows us to discuss the phenomenology of all Higgs- and Z-boson-portal scenarios on the same footing and captures the essence of more involved UV constructions that recover the proposed setup in generic regions of their parameter spaces. Despite their simplicity, SM-portal models exhibit a rich phenomenology, with potential signals in direct and indirect detection (ID) experiments, as well as in collider searches for DM. The merit of this approach, which has proven extremely popular in DM (see, e.g., Refs. [17,19,20,21,22,23,24,29,30,31,32,33]) and LHC studies (see, e.g., Refs. [34,35,36,37,38,39,40,41]), is that we may study the phenomenology of a comprehensive set of SM-portal models capturing common features
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